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XRT83SL34 데이터시트(PDF) 35 Page - Exar Corporation

부품명 XRT83SL34
상세설명  QUAD T1/E1/J1 SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
PDF  80 Pages
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제조업체  EXAR [Exar Corporation]
홈페이지  http://www.exar.com
Logo EXAR - Exar Corporation

XRT83SL34 데이터시트(HTML) 35 Page - Exar Corporation

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XRT83SL34
QUAD T1/E1/J1 SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
PRELIMINARY
REV. P1.0.8
32
RECEIVE 1:1 & 1+1 REDUNDANCY
For 1:1 and 1+1 redundancy, the receivers on the primary card should be programmed for Internal Impedance
mode. The receivers on the backup card should be programmed for External Impedance mode. Since there is
no external resistor in the circuit, the receivers on the backup card will be high impedance. This key design
feature eliminates the need for relays and provides one bill of materials for all interface modes of operation.
Select the impedance for the desired mode of operation, T1/E1/J1. To swap the primary card, set the backup
card to Internal Impedance mode, then the primary card to External Impedance mode. See Figure 15 for a
simplified block diagram of the receive section for a 1:1 and 1+1 redundancy scheme.
NOTE: For simplification, the over voltage protection circuitry was omitted.
FIGURE 14. SIMPLIFIED BLOCK DIAGRAM OF THE TRANSMIT SECTION FOR 1:1 & 1+1 REDUNDANCY
FIGURE 15. SIMPLIFIED BLOCK DIAGRAM - RECEIVE SECTION FOR 1:1 AND 1+1 REDUNDANCY
T 1 /E 1 Line
B a ckp la n e In te rfa ce
Prim a ry C a rd
B a ckup C a rd
X R T 83S L34
X R T 83S L34
Tx
Tx
Line In te rface C a rd
0.68
µF
0.68
µF
T xT S E L =1 , In te rn a l
T xT S E L =1 , In te rn a l
1:2 or 1:2.45
R xT SEL =0 , Exte rn a l
R xT S E L =1 , In te rn a l
B a ckp la n e In te rfa ce
Prim a ry C a rd
B a ckup C a rd
X R T 83S L34
X R T 83S L34
Rx
Line In te rface C a rd
T 1 /E 1 Line
Rx
1:1



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